20-bit Isolated Data Acquisition Reference Design Optimizing Jitter for Max SNR and Sample Rate TIDA-01035 (ACTIVE)

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Key Document

Description

The TIDA-01035 is a 20-bit, 1 MSPS isolated analog input data acquisition reference design demonstrating how to resolve and optimize performance challenges typical of digitally isolated data acquisition systems.

  • Significantly improves high frequency AC signal chain performance (SNR  and THD) by effectively mitigating ADC  sample clock jitter across isolation boundary
  • Maximizes sample rate by eliminating/minimizing  propagation delay introduced by a digital isolator
  • Provides option to evaluate performance with and without jitter mitigation technique with jumper
  • Includes detailed timing analysis detailing the isolator’s additive jitter impact on data throughput

Features
  • Isolated 20-bit, 1-MSPS, single channel  differential Input Data Acquisition (DAQ) system
  • Jitter mitigation technique realizes more than 18-dB  system-level SNR improvement for high frequency input signals (100 kHz Fin, 1 MSPS)
  • Reduced logic (on isolated ADC side) eliminates need for higher power and complex PLL solutions
  • Achieves 1-MSPS sampling rate while preserving low SPI CLK rates with the ADS8900B ADC’s innovative multiSPI™ and ADC-master or Source-Synchronous mode digital interfaces
  • Includes theory, calculations, component selection, PCB design and measurement results

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Design Files

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TI Devices (13)

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Part Number Name Product Family Sample & Buy Design Kits & Evaluation Modules
ADS8900B  20-Bit, 1-MSPS, 1-Ch SAR ADC with Internal VREF Buffer, Internal LDO and Enhanced SPI Interface  Analog-to-digital converters (ADCs)  Sample & Buy View Design Kits & Evaluation Modules
ISO1541  2.5-kVrms isolated unidirectional clock, bidirectional I2C isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
ISO7840  High-immunity, 100-Mbps, 5.7-kVRMS reinforced quad-channel 4/0 digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
ISO7842  5.7-kVrms, 100-Mbps, reinforced 4-channel 2/2 digital isolator  Isolation  Sample & Buy View Design Kits & Evaluation Modules
LMZ14203  SIMPLE SWITCHER® 6V to 42V, 3A Power Module in Leaded Surface Mount TO Package  Step-down (buck)  Sample & Buy View Design Kits & Evaluation Modules
OPA376  Precision, Low Noise, Low Iq Operational Amplifier  Operational amplifiers (op amps)  Sample & Buy View Design Kits & Evaluation Modules
REF5050  3 µVpp/V Noise, 3 ppm/°C Drift Precision Series Voltage Reference  Voltage references  Sample & Buy View Design Kits & Evaluation Modules
SN6501  Low-noise, 350-mA, 410-kHz transformer driver for isolated power supplies  Isolation  Sample & Buy View Design Kits & Evaluation Modules
SN74LVC1G04  Single Inverter  Buffer/driver  Sample & Buy View Design Kits & Evaluation Modules
SN74LVC1G08  Single 2-Input Positive-AND Gate  Gate  Sample & Buy View Design Kits & Evaluation Modules
THS4551  Low Noise, Precision, 150MHz, Fully Differential Amplifier  Special function amplifiers  Sample & Buy View Design Kits & Evaluation Modules
TPS709  150-mA 30-V ultra-low-IQ wide-input low-dropout (LDO) regulator with reverse current protection  Power management  Sample & Buy View Design Kits & Evaluation Modules
TPS7A47  36-V, 1-A, 4.17-μVRMS, RF low-dropout (LDO) voltage regulator  Power management  Sample & Buy View Design Kits & Evaluation Modules

CAD/CAE symbols

Part # Package | Pins CAD File (.bxl) STEP Model (.stp)
ADS8900B Download
ISO1541 Download Download
ISO7840 Download Download
SOIC (DWW)| 16 Download
ISO7842 Download Download
SOIC (DWW)| 16 Download Download
LMZ14203 Download Download
OPA376 Download Download
Download Download
Download Download
REF5050 Download Download
Download Download
SN6501 Download Download
SN74LVC1G04 Download -
Download Download
Download Download
Download
Download Download
Download -
Download
Download Download
SN74LVC1G08 Download Download
Download Download
Download
Download Download
Download -
Download Download
Download Download
THS4551 Download
Download -
Download Download
TPS709 Download
Download
TPS7A47 Download Download

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Technical Documents

See the Important Notice and Disclaimer covering reference designs and other TI resources.

Datasheet (1)
Title Type Size (KB) Date
PDF 3373 29 Jun 2017
Application notes (2)
Title Type Size (KB) Date
PDF 867 19 Sep 2016
PDF 199 23 May 2007
User guides (1)
Title Type Size (KB) Date
PDF 2414 17 Jan 2017
Design files (6)
Title Type Size (KB) Date
ZIP 458 16 Dec 2016
ZIP 5420 16 Dec 2016
PDF 4897 16 Dec 2016
PDF 848 16 Dec 2016
PDF 238 16 Dec 2016
PDF 1275 16 Dec 2016
Related Tools & Software

Reference Designs  ( 11 )

Design Kits & Evaluation Modules  ( 1 )

Name Part Number Tool Type
ADS8900B Fully-Differential Input, 20-Bit SAR ADC EVM Performance Demonstration Kit (PDK)  ADS8900BEVM-PDK  Evaluation Modules & Boards 

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